Semiflash boiler



Patented May 26, 1931 v I UNITEDA'TSTATES PATENT OFFICE,

"CHARLES A." riuinomos RIVERSIDE, ILLINOIS 'sEMIrLnsH BOILER Application filed February 21, 1930. Serial No. 430,199.

'This invention relates toasteam generating from the respective compartments and presystem. More particularly it relates to means Vents the return flow thereto.

for firing up a system of the semi-flash type. A steam outlet pipe 20 communicates with The main object of the invention is to the top of the drum 11 and with one end of provide means for rapidly firing up a semithe super-heating coil 3. The other end of 55 flash boiler having a storage drum. 1 the super-heating coil leads to a steam com- Another object is to provide means for municating means, such as the engine 21 automatically. removing a major portion of shown in the drawing. Exhaust steam from the water from the storage drum when the the engine is conduct-ed to a condenser 22. m

y t m i out of op ration. Condensate from the condenser is delivered to 60 These objects and others, which will be the hot well 7. apparent, are accomplished by the arrange- As the system shown is of the closed cir ment and functioning of elements as shown cuit condensing type,the water is continuah in the drawing and described in the detailed ly circulated through the cycle. Means may description to follow. be provided for'adding' additional water to sisting walls 4 and comprise the boiler of the If the water in the hot well becomes depleted end of the preheating coil 1, by means of a 1,7 03,228, for preventing the pump from be The drawing shows diagrammatically a supply the small amount lost, such as shown condensing steam power plant. A preheat- 1n applicants U. S.JPatent No.'1,617,586.

ing coil '1, a vaporizing coil 2, and a'super- Thereis never enough water in a system of I heater coil '3 are arranged within heat rethis kllld'tO fill the storage drum complete.

0 system. Aburner5 is positioned and adaptdue to an excess capacity of the feed water ed to be operated to supply heat to the boiler. pump for the steam being consumed and A feed water pump 6communicates with condensed, means may be provided such as a hot well 7 by means of a pipe 8 with one shown in appllcants U. '3. Patent No.

i 9 Th oth nd of th r h ating coming air bound. 1 As this invention is not coil communicates with one end of the vapor concerned with the :water supply to the sysizin'g coil 2. A water forcing means shown tem and as such means' fl 1d in he art as a pumplO is arranged with its discharge and are not necessary for the functioning of side connected to the same end ofthe vaporiza device embodying the present invention, 80

ing coil 2. The other end of the vaporizing they have not been illustrated or described. coil 2 is connected with the top of a circular A dr m P11 2 1 nnefl e t0 he bottom storage drum 11 at a tangent thereto. of thedrum 11 and to a small chamber 24,

Acylindrical partition 12spaced from the whlch contalns a thermo-sylphon. The chamside walls of the drum 11 and an annular botber 24 is positioned in heat exchanging rela- 85 tom member 13 joining the partition to the tion with the hot products of combustion walls ofthe drum dividethe drum into two from the burner 5. The sylphon element 25 chambers communicating at the top. The is provided with a valve extension 26, which outer chamber 14 is annular in cross section is adapted to close the pipe 23 when the eleand has a small capacity compared to the ment is heated. A pipe 27 connects the 90 inner chamber 15. An outlet pipe 16 comchamber 24 to the hot well 7.

municateswith the bottom of the inner cham- In the normal operation of the power plant ber 15 and with a pipe 17 leading tothe inshown in the diagram, the burner 5, the feed take of the pump 10. A similar outlet pipe water pump 6, and the pump 10 are 111 op- 18 communicates with the bottom of" the eration. The sylphon element expanded chamber 14 and with the pipe 17 leading to bythe heat from the burner prevents flow the'pump. The outlet pipe 18 is at a higher of water through the drain p pe 23. Water level than the outlet pipe 16'. Each of the from the feed water pump 6 1S preheated 1n outlet pipes 16 and 18 are provided with the e011 1 and mlxeswith water being decheck valves 19 which allow water to flow livered from the drum by the pump 10. 1%

From the vaporizing coil the mixture of steam and water is delivered tangentially into the top of the drum 11 where the steam and water is Separated. Steam from the top of the drum 11 is super-heated in the coil 3 and delivered to the engine 21. Exhaust steam is condensed by the condenser 22, the

condensate being delivered to the hot well 7. lVhen the burner 5 is shut down or for any other reason becomes inoperative, the sylphon element 25 contracts and opens the drain pipe 23, allowing all of the Water in the inner compartment 15 of the drum to flow into the hot well 7. The water in the outer compartment 14:, which constitutes a small portion of the total amount of water maintained in the drum, is retained. The check valve 19 in the outlet pipe 16 from the inner compartment prevents the flow of water from compartment 14 into the compartment 15.

When the steam generating system is again put into operation, the heat from the burner or steam from drum 11 through pipe 23 eX- pands the sylphon 25, thereby closing the drain pipe 23. The pump 10 and the feed water pump 6 are put into operation. ater from the compartment 13, together with the additional feed water being added, is forced through the vaporizing coil 2. As only a small amount of water is retained by the compartment 14, it is soon heated up and a satisfactory steam pressure is obtained in a very short time. The device is provided with means, not shown, as it is not a part of this invention, for maintaining operation of the feed water pump until the level of water in the storage drum reaches a certain height. It is, therefore, evident that the water in the storage drum will gradually build up until it reaches theregulated height, due to the continued addition of water by the feed water pump 6, which is of a capacity sufficient to add more water to the system during constant operation than is removed in the form of steam.

It will be understood that the particular arrangement of compartments in the storage drum and the particular outlet means therefrom is only one modification of the invention. It is also to be understood that any suitable means operated by a condition of the boiler may be utilized to operate'the bypass means for draining a major portion of water from the drum. Applicant limits his invention only by the scope of the appended claims.

What is claimed is:

1. In a steam generating system, water storage means, a vaporizing coil communica ing with the storage means, means for circulating water from the storage means through the vaporizing coil, and means adapted to automatically remove the major portion of the water from said storage means at a predetermined temperature.

2. In a steam generating system, water storage means, a vaporizing coil communicating with the storage means, means for circulating water from the storage means through the vaporizing coil, means adapted to automatically remove the major portion of the water predetermined temperature, and means for returning the Water to the system during normal operation thereof.

3. In a steam generating system, a water storage drum, a vaporizing coil communicating with the storage drum, one end of said coil being connected to the bottom of said drum and the other to the top thereof, means for circulating water from the drum through the vaporizing coil, and means adapted to remove the major portion of said water from circulation at a predetermined temperature of a unit of the steam generating system.

4. In a steam generating system, a Water storage drum containing a large and a small compartment communicating at the top of the drum, a vaporizing coil, means to deliver feed water to the inlet end of the vaporizing coil, means for connecting the outlet end of the vaporizing coil to the top of the storage drum, outlet pipes connecting each of the compartments to the inlet end of the vaporizing coil, check valves in said pipes, means for circulating Water from the compartments through the vaporizing coil, and means to withdraw the water in the large compartment from circulation at a predetermined temperature of a unit of the generating system.

5. In a steam generating system, a cylindrical water storage drum, a cylindrical partition in said drum and spaced from the wall thereof forming thereby an annular outer compartment and a. cylindrical inner compartment communicating at the top of the drum, a vaporizing coil, means for connecting one end of the vaporizing coil to the top of the storage drum and tangentially thereto, outlet pipes connecting each of the compartments to the other end of the vaporizing coil, check valves in said outlets, means for circulating water from the compartments through the vaporizing coil, and means for withdrawing the water in the inner compartment from circulation at a predetermined temperature of one of the units of the generating system.

6. In a steam generating system, a water storage drum containing a large and a small compartment communicating at the top, a vaporizing coil, a connection from the preheating coil to one end of the vaporizing coil, a water forcing means communicating with the same end of the vaporizing coil, means for connecting the vaporizing coil to the top of the storage drum, an outlet pipe connecting the large compartment to the Water forcing means, a second outlet connection on a higher level than the first named outlet connecting from the storage means at a V the small compartment to the water forcing means, check Valves in the outlet pipe from the large compartment and the outlet from the small compartment, a drain pipe communicating With the bottom of the large compartment, and a heat controlled Valve in said pipe adapted to drain the Water from the large compartment at a predetermined temperature of one of the units of the generating system.

In testimony whereof I affix m signature.

CHARLES A. F ENCH. 

